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Lasofoxifene

Phase 3

Metastatic Breast Cancer | Small molecule | Oncology |LeonaBio, Inc.|Last Updated: Jun 22, 2026

Target and mechanism

Molecular targetER
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

RandomizedACTIVE_CONTROLLED
Total Trials1
Total Enrollment600

FDA Designations

No designations recorded

Clinical trial landscape

Lasofoxifene · 1 trial · 1 indication

Phase 3 1
NCT05696626Evaluation of Lasofoxifene Combined With Abemaciclib Compared With Fulvestrant Combined With Abemaciclib in Locally Advanced or Metastatic ER+/HER2- Breast Cancer With an ESR1 MutationMetastatic Breast Cancer
RECRUITING600 Analytics
PHASE3RECRUITING
Evaluation of Lasofoxifene Combined With Abemaciclib Compared With Fulvestrant Combined With Abemaciclib in Locally Advanced or Metastatic ER+/HER2- Breast Cancer With an ESR1 Mutation
Metastatic Breast CancerUnlock trial analytics

Study Endpoints

Primary Endpoints

Progression free survival (PFS)
Within approximately 3 years

PFS is defined as the time from the date of randomization \[Visit 0 (Day 1)\] to the earliest date of first documented progression per RECIST 1.1 as determined by BICR or death due to any cause.

Secondary Endpoints

Objective response rate (ORR)
Within approximately 3 years
Overall survival (OS)
Within approximately 3 years
Clinical benefit rate (CBR)
Within approximately 3 years
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Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
TreatmentEXPERIMENTALPre- and Postmenopausal Women and Men with locally advanced or metastatic ER+/HER2- breast cancer who have disease progression on an AI in combination with either palbociclib or ribociclib as their first hormonal treatment for metastatic disease and who have an ESR1 mutation.
Reference TherapyACTIVE_COMPARATORPre- and Postmenopausal Women and Men with locally advanced or metastatic ER+/HER2- breast cancer who have disease progression on an AI in combination with either palbociclib or ribociclib as their first hormonal treatment for metastatic disease and who have an ESR1 mutation.

Interventions

NameTypeDescription
Lasofoxifene in combination with abemaciclibDRUG5 mg/d of oral lasofoxifene plus oral abemaciclib 150 mg twice a day
Fulvestrant in combination with abemaciclibDRUGFulvestrant 500 mg intramuscular (IM) on Days 1, 15, and 29 and then once monthly thereafter plus oral abemaciclib 150 mg twice a day
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites224

Inclusion Criteria: 1. Pre- or postmenopausal women or men. 2. Locally advanced and/or metastatic ER+ breast cancer with radiological or clinical evidence of progression on an AI in combination with either palbociclib or ribociclib as their first hormonal treatment for metastatic disease. 3. Histol...

Countries:United StatesAustraliaBelgiumCanadaChinaFranceGermanyIsraelItalyPolandRomaniaSingaporeSouth KoreaSpainTaiwanTurkey (Türkiye)United Kingdom
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Competitive Landscape -Breast Cancer 399 trials (matched to "Metastatic Breast Cancer")

Top 20 of 91 competitors

CompanyTickerTrialsLead PhaseDrugs
AstraZeneca PLCAZN46PHASE3Fulvestrant, Capivasertib
Merck & Co., Inc.MRK12PHASE3Pembrolizumab, Paclitaxel, Doxorubicin, Epirubicin, Cyclophosphamide
Eli Lilly and CompanyLLY27PHASE3Abemaciclib, Standard Adjuvant Endocrine Therapy
BioNTech SE Sponsored ADRBNTX7PHASE3DB-1303/BNT323, T-DM1
Gilead Sciences, Inc.GILD13PHASE3Sacituzumab Govitecan-hziy, Eribulin, Capecitabine Product, Gemcitabine, Vinorelbine
Novartis AG Sponsored ADRNVS30PHASE3Ribociclib
Pfizer Inc.PFE34PHASE3ARV-471, Fulvestrant
BeOne Medicines Ltd. Sponsored ADRONC5PHASE3BGB-43395, Letrozole, Abemaciclib, Palbociclib, Ribociclib
Olema Pharmaceuticals, Inc.OLMA5PHASE3Palazestrant, Fulvestrant, Anastrozole, Letrozole, Exemestane
Jazz Pharmaceuticals Public Limited CompanyJAZZ3PHASE3Zanidatamab, Trastuzumab, Eribulin, Vinorelbine, Gemcitabine
Celcuity Inc.CELC3PHASE3Gedatolisib, Palbociclib, Fulvestrant, Alpelisib
Relay Therapeutics, Inc.RLAY2PHASE3Zovegalisib, Capivasertib, Fulvestrant
GSK plc Sponsored ADRGSK2PHASE3Niraparib
Greenwich LifeSciences, Inc.GLSI1PHASE3GLSI-100
Bristol-Myers Squibb CompanyBMY5PHASE2Iza-bren, Nab-paclitaxel, Paclitaxel, Capecitabine, Carboplatin
BriaCell Therapeutics CorpBCTX1PHASE3SV-BR-1-GM, Cyclophosphamide, Interferon infiltration of the inoculation site, Retifanlimab, Treatment of Physician's Choice
Incyte CorporationINCY4PHASE2Ruxolitinib, Capecitabine, Regorafenib
Natera, Inc.NTRA3PHASE2Discontinuation of the anti-HER2 maintenance therapy
Puma Biotechnology, Inc.PBYI3PHASE2Neratinib, Loperamide, Colesevelam
Atossa Therapeutics, Inc.ATOS1PHASE2endoxifen, goserelin
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Recent Changes (Last 90 Days)

LOWJun 22, 2026NCT05696626Enrollment: 500 → 600
LOWJun 22, 2026NCT05696626Enrollment: 500 → 600